Silicon dioxide is an inorganic compound with the chemical formula SiO2. Silicon atoms and oxygen atoms are arranged in long-range order to form crystalline silicon dioxide, while short-range or long-range disordered arrangement forms amorphous silicon dioxide.

In silicon dioxide crystals, silicon atoms are located at the center of a regular tetrahedron, and four oxygen atoms are located at the four vertices of the regular tetrahedron. Many of these tetrahedra are connected by oxygen atoms at the vertices, and each oxygen atom is shared by two tetrahedra, meaning that each oxygen atom is combined with two silicon atoms.

The simplest formula for silicon dioxide is SiO2, but it does not represent a simple molecule (it only represents the ratio of the number of silicon and oxygen atoms in a silicon dioxide crystal).

Pure natural silica crystals are a hard, brittle, insoluble, colorless and transparent solid commonly used in the manufacture of optical instruments.

physical property:

Silicon dioxide forms a series of different homogeneous polymorphs, such as quartz, quartzite, and quartz, in addition to quartz, coesite, and quartz. Especially low-temperature quartz, abbreviated as quartz, is the most common type and one of the main components of the Earth's crust.

chemical property:

Silicon and carbon have similar properties, but their oxide properties differ greatly. CO2 is a molecular crystal, while SiO2 is an atomic crystal. SiO2 is a three-dimensional network structure formed by the basic structure of silicon oxygen tetrahedra.